Options for running kitchen extractor outside

[aveatry]

I used to have the flat 100x50 channel hidden in a false ceiling gap but recently took down the false ceiling and replaced the 100x50 with 100mm round running on top of new units and the performance gain is massive, I would avoid the flat channel. Also do away with the flexible section that you already have, the flex impedes the flow

 

[chirpychippy]

204mm x 60mm to 5 inch Round Adaptor | Manrose (55700 / MONV5613)

Beat me to it Chirpy

Yes 204 x 60 not 220 x60 that would be 220x90 which is better suited for long runs in lofts.

 

[chirpychippy]

I used to have the flat 100x50 channel hidden in a false ceiling gap but recently took down the false ceiling and replaced the 100x50 with 100mm round running on top of new units and the performance gain is massive, I would avoid the flat channel. Also do away with the flexible section that you already have, the flex impedes the flow

100 x 50 is undersized for any extractor it amounts to 4 inch ducting. The minimum is 5 inch short distance, 6 inch longer distance.

A 4 inch duct means the motor has to work harder to force the air through which makes the extractor noisy.

 

[aveatry]

100 x 50 is undersized for any extractor it amounts to 4 inch ducting. The minimum is 5 inch short distance, 6 inch longer distance.

A 4 inch duct means the motor has to work harder to force the air through which makes the extractor noisy.

Yes it was noisy too. But it was my only option at the time and better than recirculate